Upaya mengatasi cacat produksi botol kemasan air 600 ml dengan metode Statistical Process Control

Abstract

This research aim is to findout type of defects in prodution process of 600 ml bottle water at PT TIB Jember, then some attemps to resolve the problem. The p-chart of Statistical Process Control was employed. The control chart in September 2019 shown that some data beyond the ultimate control limit (UCL). The defects were categorized into three: whitening, deviate form, and broken. The Pareto chart revealed that the aforemention defects were 59.7%, 26.36% and 15.07% respectively. By using fishbone diagram some root cause of the defects were found. First, the unstable workpalce temperature which disturb the preform melting process prior to blowing, therefore causing whitening the bottle. Second, the heater which is often turned off while processing that caused deviate form. The frequently turned off the heater was caused by cracked-damage along the hoses of overdue. Some suggestions were given, one of them was replacing the hoses by the new ones. The new control chart on October 2019 shown that all data within the limits following the hoses replacement. It also reduced the rate of defect by 0.19% from 0.74% to 0.55%.